Spawn Chunks

Against popular belief spawn chunks DO exist on bedrock edition. These chunks around the central world chunk (x 0, z 0) are there mostly for performance reasons. If you have ever went into a portal and came back you will know that the transfer from nether to overworld is much faster than the opposite. This is because of spawn chunks. This can help you load those chunks to the loaded status much quicker than if they were fully unprocessed. These chunks form a rounded 11x11 square of unloaded chunks and of course bordering them is a rounded 15x15 square of locked chunks.

(Visualization by @kiwixite on discord)